2001 Mercury Grand Marquis Problems

What owners report

Owners of the 2001 Grand Marquis most often describe unintended or erratic acceleration and throttle/cruise-control behavior, followed by seat belt buckles that unlatch on their own. Coolant leaks from the composite intake manifold leading to overheating, and air bags that fail to deploy in frontal impacts, are the other recurring themes. Complaints arrive across a wide mileage span, from under 20,000 miles to well past 150,000.

1. 1
   Seat belts

   Seat belt buckle releases on its own

   • 17 complaints (11%)
   • median 79,200 mi at 9.5 yrs old (13 state mileage)
   • 2 mention a crash, fire or injury
   • filed 2001–2022

   Owners describe the driver or passenger front belt coming unlatched while driving, or the buckle refusing to latch at all, and in some reports the belt releases repeatedly on the same trip. Several owners say the dealer found no fault or told them there was no recall covering their vehicle, and at least one was quoted a repair cost at their own expense. Some complaints reference recall 01V227001 for the front buckle assembly. Spread from about 40,000 to roughly 164,000 miles, with several reports clustered near 50,000-90,000.

   Recall 01V2270011 related service bulletin

   What to check: Latch and firmly tug each front belt, then check the build date against recall 01V227001 (St. Thomas plant, 4/17/00-5/29/01) and ask whether the buckles were replaced.

   2 excerpts from owner complaints in NHTSA records

   “While driving the car the drivers and passengers seat belts release. I took it to a mechanic and they said the spring in the seat belt holder is failing. It isn't very unsettling to be driving the car and the seatbelt releases for no reason. It could be related to the 2000 seatbelt recall. We just bought the car for my college student. I don't want to wait for a death to get a recall.”

   NHTSA complaint #11072065, filed 2018-02, 79,200 miles

   “The driver seat belt buckle on my 2001 Mercury Grand Marquis unbuckles on its own. I buckle up, pull on it, and start out on the road. Next thing I know is the buckle comes apart and then its just a repeat of the same thing for the rest of the trip. Took the vehicle to cortese in rochester, ny and was told there was no recall on it. They buckled the belt but couldn't get it to fail in the shop. If I have an accident I will sue based on all the issues I am seeing on this site, and ford's unwilling to fix it. …”

   NHTSA complaint #10280918, filed 2009-08, 97,000 miles
2. 2
   Vehicle speed control

   Unintended acceleration / throttle and cruise control surge

   • 17 complaints (11%)
   • median 48,000 mi at 6.7 yrs old (12 state mileage)
   • 7 mention a crash, fire or injury
   • filed 2001–2021

   Complaints describe the car accelerating on its own, sometimes from a stop and sometimes while cruising, and in several cases the brake pedal or turning off cruise control did not slow it. Some owners describe the gas pedal failing to return after being pressed, or the cruise control moving the pedal up and down rapidly and causing the car to jerk. Dealers are variously reported as unable to duplicate or diagnose the problem, and several vehicles were left unrepaired. Reported from under 20,000 miles up to about 220,000, at a mix of highway and low-speed conditions.

   What to check: Test the throttle for free, smooth return and check whether the cruise control disengages cleanly on the brake; ask whether the throttle cable and cruise servo have been inspected or replaced.

   2 excerpts from owner complaints in NHTSA records

   “Cruise control moves gas pedal rapidly down and back up at a rate of 1 to 2 occilations per second, at times car can be felt to jerk back and forth. Dealer has made many attempts to correct the issue under warrenty but now is being told that ford will no longer pay for repairs. I feel this may be a safety issue as I do not know when the car may accelerate out of controll.”

   NHTSA complaint #10038929, filed 2003-09, 32,700 miles

   “I was turning into my drive way and the car all of a certain accelerated to a speed up and I immediately jump on to the brake to stop the car and it crashed into the back fence . I got out the car to check and see if the pedal had the floor mat on it and their was nothing on it.”

   NHTSA complaint #10511846, filed 2013-05, 163,284 miles
3. 3
   Air bags

   Air bag does not deploy in a frontal crash

   • 13 complaints (8%)
   • median 52,489 mi at 6.5 yrs old (11 state mileage)
   • 12 mention a crash, fire or injury
   • filed 2002–2022

   Owners report frontal or side impacts in which one or both front air bags failed to deploy while occupants were injured; in a few cases only the passenger bag deployed. Some complaints link the non-deployment to an electrical fault, including a stored air bag diagnostic code and a drained battery. Recalls covering the restraint control module and crash sensors are referenced in complaints, and some owners were told their vehicle identification number was not included. Reported across roughly 12,000 to 198,000 miles, always in the context of a collision.

   Recall 00V412000Recall 00V270000

   What to check: Have the air bag system scanned for stored codes and confirm the air bag warning lamp does the normal self-test at startup; ask whether recalls 00V412000 and 00V270000 were performed.

   2 excerpts from owner complaints in NHTSA records

   “My father in law was driving my vehicle when a gmc yukon pulled out in front of him. My father in law hit the side of the yukon and only one air bag deployed which was the passanger side,my father in law was taken to the hospital bc of no feeling below his waist and the paramedics were unable to stabilize his blood pressure.”

   NHTSA complaint #10496015, filed 2013-01, 82,700 miles

   “Tl - the vehicle was a 2001 Mercury Grand Marquis. While driving the gas pedal became stuck. The vehicle then side swiped two other vehicles. The vehicle went off the road and hit a tree. The passenger side front was damaged. The air bags did not deploy. The failure mileage was 25,000. The passenger and driver sustained injuries. The vehicle was towed. Pictures were taken ,and a police report was filed.”

   NHTSA complaint #10187586, filed 2007-04, 25,000 miles
4. 4
   Exterior lighting

   Headlights and lighting control module failures

   • 11 complaints (7%)
   • median 106,500 mi at 15.2 yrs old (8 state mileage, few)
   • 1 mention a crash, fire or injury
   • filed 2001–2020

   Complaints describe headlights and warning or signal lamps cutting out intermittently or going dark entirely while driving at night. In several cases a mechanic traced the problem to the lighting control module; one owner was told the wrong fuse rating had been fitted. Owners also describe dim headlights that glare off the road and are hard to see past oncoming traffic, which a dealer described as normal for the design. Mostly reported from about 40,000 to 149,000 miles, typically during night driving.

   What to check: Check that all lamps including high and low beams and turn signals work, look for evidence of a replaced or repaired lighting control module, and verify fuse ratings in the lighting circuits.

   2 excerpts from owner complaints in NHTSA records

   “Was driving down hwy 12 at night september 26 2019 and all I remembered was my lights shutting off due to lighting control module which I learned after the fact didnt have major accident but did hit small ditch and bent up my bumper”

   NHTSA complaint #11259033, filed 2019-09, 138,000 miles

   “The contact owns a 2001 Mercury Grand Marquis. While driving 60 MPH, the front and rear warning and signal lamps failed to illuminate. In addition, both high and low beam head lamps failed to illuminate. The vehicle was taken to an independent mechanic where it was diagnosed that the light control module failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 96,321.”

   NHTSA complaint #10807464, filed 2015-11, 96,321 miles
5. 5
   Engine cooling

   Coolant leak from composite intake manifold

   • 12 complaints (8%)
   • median 110,000 mi at 8.9 yrs old (9 state mileage, few)
   • filed 2004–2023

   Complaints describe coolant pooling under the car or leaking from the front of the plastic intake manifold, sometimes dripping onto the ignition coils, with the temperature warning light or check engine light coming on. Owners report overheating, white smoke, rough running, and in one case a piece of manifold material entering a cylinder. An extended coverage program on the composite manifold is mentioned by owners; dealers are reported as declining work once coverage or warranty had expired. Most often reported between roughly 97,000 and 135,000 miles, but also seen near 100,000.

   1 related service bulletin

   What to check: Look for coolant residue or crust along the front of the intake manifold and under the thermostat area, and ask whether the manifold has been replaced or covered under the extended coverage program.

   2 excerpts from owner complaints in NHTSA records

   “The 1996-2001 Mercury Grand Marquis with a 100% plastic intake manifold is known for engine overheating, even with normal use, and a coolant leak from the front of the manifold. This will often trigger the check engine light and low engine coolant warning light. The engine coolant leak is from a factory defect, which causes cracking on the front coolant passage of the intake manifold. In a very short time, this leak will lead to engine overheating issues, especially while the vehicle is idling. This is exactly what happened. …”

   NHTSA complaint #11012085, filed 2017-08, 110,000 miles

   “Small piece of plastic from intake went into the cylinder #4 and rapped around one of the values causing this value to stay open so cylinder #4 has no compression.”

   NHTSA complaint #10226945, filed 2008-05, 124,301 miles

Buying note. A pre-purchase inspection that includes a throttle and cruise control check, a seat belt latch test, an air bag code scan and a look at the intake manifold for coolant residue covers most of what owners of this model year describe. Confirm any open recalls by vehicle identification number, since owners report being excluded despite matching symptoms.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.